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Aspirated Thermocouple

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The ASPTC is a type E thermocouple housed in a white, elongated radiation shield. The radiation shield reduces solar loading on the thermocouple by drawing air across the measurement junction with a fan. The radiation shield also protects the thermocouple, increasing its durability.

Typically, one ASPTC is mounted to each sensor arm in a Bowen ratio system. One ASPTC can either replace, or be measured in addition to, TCBR thermocouples. In a standard configuration, lead lengths of 15 feet are recommended for both signal and power cables.

  • Uses fine wire thermocouple for highly accurate air temperature measurements
  • Includes aspirated radiation shield
  • Solar loading on thermocouple reduced by drawing air across the measurement junction with a high-powered fan
  • Intake velocity is 5.5 m/sec
  • Fan requires 12 Vdc power supply
  • Fan average active current drain is 142 mA
  • Weight: 1.9 lbs (0.86 kg); 1.6 lb (0.7 kg) without cable
  • Length: 21" (53.3 cm)
  • Height: 5.8" (14.7 cm)
  • Large diameter: 2.3" (5.8 cm)
  • Small diameter: 1.8" (4.6 cm)
  • Power cable diameter: 0.2" (0.5 cm)
  • Signal cable diameter: 0.1" (0.3 cm)


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